JPH0350897Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to disposable diapers. More specifically, the present invention relates to an inexpensive and compact disposable diaper that does not leak urine and has improved fit in the crotch area.

[Conventional technology and its problems]

As is well known, disposable diapers have a liquid-permeable top sheet made of a nonwoven fabric such as polyester, polypropylene, or rayon, and a liquid-impermeable back sheet made of a film such as polyethylene. It has a structure in which absorbent material made of polymer or the like is sandwiched in between, and it is becoming widely used because it is convenient to carry.

These disposable diapers usually have elastic members attached along both side edges of the crotch area to prevent urine leakage.

Conventionally, disposable diapers generally referred to as elastic type diapers have been sold in which rubber thread or the like is inserted into both side edges of the crotch portion of the diaper as the elastic member, and gears are provided in the crotch portion. These diapers have relatively little urine leakage from the crotch area, but during use, the elastic members such as thread rubber get stuck in the legs, causing redness and dripping, and the diapers are too tight, resulting in poor breathability. There were problems with stuffiness and diaper rash.

Products that have improved on these shortcomings are known that use elastic members that shrink when water leaks, but in this case, they only shrink when urine leaks, and they leak from the armpits or only shrink on one side and cause the legs to shrink. There were problems such as feces leaking from the crotch because the contraction effect was not exerted when the body part was squeezed or diarrhea-like stool occurred. As a means of solving these problems, the inventors of the present invention previously proposed a disposable diaper in which foamable plastic sheets were fixed to both edges of the crotch section in the longitudinal direction of the diaper.
(Japanese Patent Application No. 60-222862) As a result of intensive studies to further solve the above problems, the inventors of the present invention have found that it is an inexpensive product that does not leak urine, does not fit snugly in the crotch area and does not cause rashes. He discovered a compact disposable diaper and completed the invention.

(Purpose of the invention) That is, the present invention is to solve the problems of the conventional disposable diapers as described above, and to provide an inexpensive and compact disposable diaper that is desirable as a disposable diaper.

(Structure of the invention) The invention constitutes a diaper by interposing an absorbent material between a liquid-permeable top sheet and a liquid-impermeable back sheet,
A cushioning sheet is fixed along opposite side edges of the crotch portion in the longitudinal direction of the diaper, and both longitudinal edges are folded upward inside the fixed portion of the cushioning sheet, and the top sheet of the folded portion is In a disposable diaper formed by adhering a facing top sheet, the outside 2 to 15 of the cushioning sheet
This disposable diaper is characterized in that elastic members are arranged along opposing side edges of the crotch section in the longitudinal direction at positions of mm.

The cushioning sheet in the present invention is used in the crotch area to improve the adhesion between the diaper and the crotch area. Suitable cushioning sheets include foamed plastic sheets, nonwoven fabric sheets, laminated paper, etc. Can be used.

The thickness of the foamed plastic sheet is 0.5-3.0mm.
It is preferably within the range of 1.0 to 2.0 mm. The width of the foamable plastic sheet may range from 5 to 30 mm, preferably from 10 to 25 mm.

In addition, the materials for the nonwoven sheet are nylon,
Hydrophobic materials such as polyester and polypropylene are preferable, but even rayon-based materials can meet the purpose of the present invention as long as they have been treated to be water repellent. As nonwoven fabrics that can be used, both wet and dry methods can be used.

In addition, the cushioning sheet made of paper may be a single piece of cardboard or a so-called laminated paper made by laminating several sheets of paper, but it must be soft against the skin. , several layers of paper, such as water-absorbing paper, are suitable. Also,
In order to make it waterproof, it is desirable that this sheet be treated with water repellent treatment.

The thickness of nonwoven fabric sheets, cardboard sheets, or laminated paper may be in the range of 0.5 to 3.0 mm, but preferably
It is 1.0~3.0mm. Also, the width of the sheet is 5
A range of ~30 mm is acceptable, but preferably a range of 10 to 25 mm. The length at both edges should cover the crotch area sufficiently.

The cushioning sheet is fixed by hot melt adhesion or heat sealing between the top sheet and the back sheet at both longitudinal edges of the crotch of the diaper. In the present invention, after fixing the cushioning sheet to both side edges, an elastic member is further provided on the outside in parallel with the cushioning sheet in the longitudinal direction of the crotch, and is folded back to the top sheet side of the diaper inside the cushioning sheet area. The top sheet on the folded side edge and the opposing top sheet are fixed to each other by hot melt adhesive or the like at a portion inside the fixed portion of the cushioning sheet. The fixation of the top sheets to each other may be in the form of a plurality of dots in the crotch area or in one spot.

When actually using the diaper of the present invention, the folded portion of the cushioning sheet is spread outward, and the diaper is worn so that the cushioning sheet portion tightly contacts the user's crotch region.

As the foamable plastic sheet, any of foamable polyethylene, polystyrene, and polyurethane can be used, but a foamable polyethylene sheet is preferable from the viewpoint of flexibility and strength when folded.

In addition, the nonwoven fabric sheet or cardboard sheet fixed between the top sheet and the back sheet can be treated to be water-repellent to prevent urine from leaking to the armpits.
Commercially available silicone-based, fluorine-based, etc. agents can be used as water repellent treatment agents.

In addition, elastic members installed on the outside of the cushioning sheet include thread rubber, flat rubber, elastic film,
Materials such as polyurethane rubber are available;
2 to 15 in parallel on both outer sides of the cushioning sheet.
It is desirable to install it at a position of mm, preferably at a position of 5 to 10 mm, from the viewpoint of fitting to the crotch. When the elastic member of the present invention is used together with a foam sheet as a cushioning sheet, its elastic force may be very weak, and the elongation magnification at the time of installation is 1.5 to 3.0 times.
Desirably, it is about twice as long, and the elastic force when stretched to a length of 40 cm is 30 to 150 g, preferably 50 to 150 g.
It is fine as long as it is within 100g.

The present invention will be described in more detail below with reference to the accompanying drawings.

FIG. 1 and FIG. 2 are plan development views with a partially cut away portion showing an example of the disposable diaper of the present invention.

Figure 3 is a cross-sectional view taken along the line X-X' in Figures 1 and 2, and Figure 4 shows a cushioning sheet that is folded inward in the longitudinal direction and a dotted adhesive point is placed in the center of the folded part. FIG. 5 is a cross-sectional view showing the state in which both edges are expanded outward when installed. FIG. FIG. 3 is a cross-sectional view showing the state before adhesion of the central portion containing a super absorbent polymer.

In FIGS. 1 to 6, 1 is a top sheet, 2 is a back sheet, 3 is a water-absorbing material, 4 is a cushioning sheet, 5 is an elastic member, 6 is a fastening tape, 7 is an adhesive point, and 4 is a cushioning sheet. In Figure 6, 11 is water-absorbing paper, 12 and 13 are water-absorbing materials, and 14 is a super absorbent polymer layer.

The absorbent material 3 is usually made of cotton-like pulp, water-absorbent paper, and super-absorbent polymer, and usually the super-absorbent polymer is present in layers or uniformly in the cotton-like pulp, and these are covered with water-absorbent paper, and this absorbent material is The material is
It is fixed to a back sheet 2 made of polyethylene or the like by hot melt adhesive. A cushioning sheet 4 made of a foamed plastic sheet or the like is fixed to the back sheet 2 by hot melt adhesion or heat seal adhesion, and an elastic member 5 such as thread rubber is similar to the foamed plastic sheet and has a thickness of 1.5 to 1.5 mm by hot melt adhesion. Fix it at 3.0x expansion.

Furthermore, a top sheet 1 made of a non-woven fabric such as polyester is bonded to a back sheet 2 using a hot melt adhesive.
It is bonded and integrated with the foamable plastic sheet 4, elastic member 5, and absorbent material 3. Furthermore, both sides of the diaper in the longitudinal direction are folded inward from the foamed plastic sheet 4, and the top sheet facing the folded side edges is dot-bonded using the same hot melt adhesive at the center of the longitudinal direction. (See Figure 4). By doing so, it is possible to wrap it in a folded state when packaging it, but
When attached to a baby, the folded portions are spread outward as shown in FIG. 5 (in this case, only the point contact portions 7 are glued and do not open). The elastic member 5 allows it to fit snugly to the baby's crotch. When a hydrophobic material is used as the foamable plastic sheet 4, it is possible to prevent urine from leaking into the armpits. Furthermore, since the elastic member is weakly attached to the outside compared to the conventional elastic type, the legs are not tightly tightened, so there is no problem of diaper rash or sores due to stuffiness. The absorbent material 3 may be either rectangular as shown in FIG. 1 or of a type as shown in FIG. 2.

[Brief explanation of the drawing]

Figures 1 and 2 are a plan development view with a partially cut out portion showing an example of the disposable diaper of the present invention;
The figure is a cross-sectional view taken along the line X-X' in Figures 1 and 2, and Figure 4 is the center of the diaper of the present invention, with the cushioning sheet folded back in the longitudinal direction on the inside and an adhesive point provided at the center. Fig. 5 is a cross-sectional view showing the state in which both edges are expanded outward when installed, and Fig. 6 is a cross-sectional view showing the state in which both edges are expanded outward when installed. It is a sectional view showing a state before the provided central portion is folded back and bonded. 1...Top sheet, 2...Back sheet, 3...
Absorbent material, 4... Foamed plastic sheet, 5...
...Elastic member, 7...Adhesion point, 11...Water absorbing paper, 1
2, 13...Water absorbing material, 14...Super absorbent polymer layer.

Claims (1)

[Claims for Utility Model Registration] 1. A diaper is constructed by interposing an absorbent material 3 between a liquid-permeable top sheet 1 and a liquid-impermeable back sheet 2, and The cushioning sheet 4 is fixed along the side edges of the cushioning sheet 4, and the longitudinal side edges are folded upward inside the fixed portion 7 of the cushioning sheet 4, and the topsheet of the folded portion and the opposing topsheet are folded. A single-use disposable diaper made of adhesive material, characterized in that an elastic member 5 is disposed at a position 2 to 15 mm outside the cushioning sheet 4 along opposing side edges of the crotch portion in the longitudinal direction. Diapers. 2. The disposable diaper according to claim 1, wherein the cushioning sheet 4 is a foamable plastic sheet. 3. The disposable diaper according to claim 1, wherein the cushioning sheet 4 is a nonwoven fabric sheet. 4 Cushioning sheet 4 has a thickness of 1.5 to 3 mm
The disposable diaper according to claim 1, 2, or 3 of the utility model registration claim, which has a width of 5 to 30 mm. 5 The expansion magnification when the elastic member 5 is installed is 0.5 to 3.0 times, and the elastic force when stretched to a length of 40 cm is 30 to 3.0 times.
The disposable diaper according to claim 1 of the utility model registration claim, which weighs 150g.